Keval and Co-primes

Keval has a knack for numbers. He is always fascinated by them. One type of numbers, that intrigue him the most are the prime numbers. He always loves pairs of numbers which are co-prime to each other. He has now discovered a problem he needs to solve. But, of course, as all the characters in a coding question, he is lazy AF. But lucky him, that you have been appointed his PA. He came across a pro